Multi-Temporal InSAR-Based Crustal Deformation Analysis in a Few Tectonically Active Regions of North East India

Ground deformation in tectonically active regions like Northeast India poses significant challenges for seismic hazard assessment. This study focuses on the application of Interferometric Synthetic Aperture Radar (InSAR) to monitor ground deformation in a few tectonic fault zones in Northeast India. InSAR time series analysis revealed distinct patterns of ground deformation across the Barapani Shear Zone, Dawki Fault, and Kopili Fault regions in Northeast India. The Barapani Shear Zone exhibited varying deformation rates, with higher rates in the northern part and lower rates in the southern part. Differential movements were observed along the Dawki Fault, with uplift in the northern block and subsidence in the southern block. The Kopili Fault showed subsidence on the northeastern side and uplift on the southwestern side. Validation against GPS data demonstrated a high level of accuracy and strong correlation ($\mathrm{R}^{2}$ value of 92%) between InSAR-derived deformation and ground truth GPS measurements.